Move IncludeFilesTest from old to new test directory

Author: ahornace

test/org/opensolaris/opengrok/configuration/IncludeFilesTest.java renamed to opengrok-indexer/src/test/java/org/opengrok/indexer/configuration/IncludeFilesTest.java

@@ -20,7 +20,7 @@
 /*
  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
  */
-package org.opensolaris.opengrok.configuration;
+package org.opengrok.indexer.configuration;
 
 import java.io.BufferedWriter;
 import java.io.File;